In the present study, vapor permeation and pervaporation of aqueous 2‐propanol mixtures were investigated using Torlon poly(amide imide) as a membrane material. Torlon membranes preferentially permeated H2O from aqueous 2‐PrOH mixtures both by vapor permeation and pervaporation. Diffusion experiments led to the conclusion that both solubility selectivity and diffusivity selectivity showed a preference for H2O. Solubility selectivity is by far the dominant factor governing permselectivity, and as a result, Torlon membranes showed permselectivity toward water in vapor permeation and pervaporation. The present study showed that Torlon poly(amide imide) is a membrane material potentially applicable to the dehydration of water miscible organics.